The 20 ton capy trucks were under older cars. The ones of this era around today are the various outfit boxcars of 4000 series. All these car would date from the 1890's and before. When the large fleet of boxcars and gons began showing up in the early 1900's, they rode on 25 ton capy trucks. The trucks are very similar - if not identical. The main difference being the heavier springs used in the trucks. Most all the 20 ton trucks surviving today have the "flip open" journal box lids like those you have one your 2-foot gauge truck. Both types exist on 25 ton trucks.